Environmental laboratoryCollects water quality samples from lakes and other water bodies in King County, and performs analysis at its labs for trace metals, organics, conventionals, microbiology and aquatic toxicology.

Hydrography - interactive map
Note: this link will open a new browser window
Zoom in to your area of interest. In the layers list, click "Hydrography" and the layers you need such as "Lakes and large rivers."

Lake history

History of King County's regional wastewater treatment utility
Read how our region worked to keep our lakes and Puget Sound clean and healthy, including the early days of sewage treatment and disposal in King County, the birth of Metro and development of regional facilities to process the waste produced by our metropolitan area.